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Zenith Vintage Zenith ref A6621 Keyhole Automatic Cal 2542 PC vintage 60s

Ref. no. a6621

Zenith Vintage a6621 (1965) - White dial Unknown Steel case (1/8)
Zenith Vintage a6621 (1965) - White dial Unknown Steel case (2/8)
Zenith Vintage a6621 (1965) - White dial Unknown Steel case (3/8)
Zenith Vintage a6621 (1965) - White dial Unknown Steel case (4/8)
Zenith Vintage a6621 (1965) - White dial Unknown Steel case (5/8)
Zenith Vintage a6621 (1965) - White dial Unknown Steel case (6/8)
Zenith Vintage a6621 (1965) - White dial Unknown Steel case (7/8)
Zenith Vintage a6621 (1965) - White dial Unknown Steel case (8/8)
€ 2.000

+ € 35 insured shipping

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Description

The Zenith A6621 was introduced on the occasion of Zenith's centenary in 1965 and was produced until about 1969. The design may surprise today's watch collectors, but it was very popular back then. The bi-color dial features three silver-colored sections that appear lighter or darker depending on the viewing angle. The stainless steel case consists of a wide beveled bezel, which has a date display under a loupe at 6 o'clock. This creates the shape of a keyhole, which is why the cool nickname has become popular among vintage collectors, recently serviced…

Case:
o UFO-style stainless steel case, serial 621A101, profissional polished
o Fine condition with strong geometry
o 35mm without crown / 38mm lug to lug / 10.5mm thickness / 18mm lug width
o Plexiglass with minor scratch and marks, specifically in the magnifying glass in the date window area.
o Generic crown - Important Note regarding the Original Crown: The watch has recently undergone a full mechanical service and is currently fitted with a functional replacement crown for daily operation. The highly sought-after original Zenith star-signed crown is included in the sale as an uninstalled spare part. During the service, it was noted that a fragment of the previous stem remains lodged inside the original crown's thread. To strictly preserve the integrity of this rare original part and avoid any risk of cosmetic or structural damage through aggressive extraction methods, the watchmaker opted to leave it untouched. It is delivered alongside the watch, allowing the future owner to decide whether to undergo specialized micro-extraction (such as an alum bath solution) to reuse it.

Movement:
o Mechanical Automatic cal. Cal 2542 PC - serviced by watchmaker in May 2026
(movement was disassembled, washed, lubricated) - photo of timegrapher

Dial:
o flawless two-tone dial - date window under a magnifying glass at 6 o'clock - signed "SWISS MADE

Bracelet Material:
o New 18mm in dark blue leather, with generic steel buckle

Conclusion:
This Zenith 'Keyhole' A6621 is a masterclass in 1970s Swiss watch design, combining a robust manufacture movement with an unmistakable retro-futuristic aesthetic. Ready to wear and accurate after its recent overhaul, it represents a fantastic opportunity for serious Zenith collectors to acquire an authentic piece of space-age horological history.

please see photos as they are part of the description.
No box or papers, no water proof test, sold as is, any question feel free for ask...
Keep in mind that it is a vintage watch, it is normal to be 1/2 minute early or late
wrist-treasure

Information

Ad. no. BBBBBDFFDH
Brand Zenith
Model Vintage
Reference no. a6621
Category Vintage
Year of production 1965
Gender Unisex
Availability Ready to ship in 1-3 days
State Pre-owned
Condition Good
Original papers No
Original box No
Price € 2.000
Warranty Yes

Caliber

Movement Automatic

Case

Case material Steel
Dial White

Bracelet

Bracelet material Leather

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New / unworn
The watch has not been worn and is in new condition. It may come directly from an authorised dealer or the brand itself, or it may have been recently traded without being worn.
Pre-owned
The watch has previously been traded and may show light to visible signs of wear, depending on the stated condition.

The condition is determined by the seller based on visual inspection and functional assessment in accordance with Wristler guidelines.

New
Sourced directly from an authorised dealer or the brand. Unpolished and free from signs of wear. Delivered with full manufacturer’s warranty. The warranty period begins upon registration with the brand and may have already started prior to delivery to the final buyer.
Unworn
Previously traded but never worn. May qualify as New Old Stock (NOS). Free from visible signs of wear. Does not imply anything about remaining manufacturer’s warranty or the presence of factory stickers.
Very good
Minor signs of wear such as hairline marks or small surface scratches. Case, bezel, and bracelet retain sharp edges and overall form. May have been professionally polished without affecting the original contours. Fully functional mechanically.
Good
Visible signs of wear such as scratches, small dents, or light bracelet stretch. May have been professionally polished. Fully functional mechanically.
Fair
Clearly visible signs of wear, including scratches, dents, or noticeable bracelet or clasp wear. Servicing may be recommended in the future. Fully functional unless otherwise stated.

All watches offered on Wristler are fully functional and meet normal expectations for mechanical performance unless explicitly stated otherwise. The seller provides a guarantee on proper mechanical operation.

Water resistance cannot be guaranteed for older watches unless specifically indicated.

If you have any doubts about the condition, carefully review the photos and description. You may contact the seller via chat to request additional photos or video material to better assess the watch before purchase.

Manufacturer's warranty
The manufacturer offers a 2-year international warranty from the warranty activation date. This date can differ from the year of production, so the remaining warranty depends on this specific watch; see its papers.

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Product

Article type
Watch
Brand
Zenith
Reference no.
a6621

Manufacturer

Zenith Branch of LVMH Manufactures S.A.
34 rue des Billodes
Le Locle
Switzerland
Email
customer.service1@zenith-watches.com

EU responsible

LVMH Watch & Jewelry Central Europe GmbH
Zimmersmühlenweg 8-10
61440 Oberursel
Germany
Email
customer.service1@zenith-watches.com
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